Bump rx from 1.6.1 to 3.0.1
Bump rx from 1.6.1 to 3.0.1

Bumps [rx](https://github.com/ReactiveX/RxPY) from 1.6.1 to 3.0.1.
- [Release notes](https://github.com/ReactiveX/RxPY/releases)
- [Changelog](https://github.com/ReactiveX/RxPY/blob/master/changes.md)
- [Commits](https://github.com/ReactiveX/RxPY/commits)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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